The water quality in hydronic systems directly affects the performance and life expectancy of the components in the systems. Total dissolved solids (TDS) and pH... READ MORE
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Parallel Pumping: 2-Position Control Valves on Multiple Cooling Towers (Part 5)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 29, 2016
Over the last few weeks the Monday Morning Minutes posts have looked at pumping issues with multiple condensers and pumps. One of our most-received questions... READ MORE
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Parallel Pumping with Unequal Condensers (Part 4)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 22, 2016
Over the last few weeks our Monday Morning Minutes posts have looked at pumping issues with parallel, equal-sized condensers and pumps. This week we will look... READ MORE
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Parallel Pumping in Condenser Applications: Automatic Differential Pressure Control (Part 3)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 15, 2016
Chilled water condensers are normally operated as constant-flow devices and the pumps serving them are constant-speed. Why would you ever use a variable-speed drive for... READ MORE
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Parallel Pumps in Condenser Applications: Limiting the Flow Rate (Part 2)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 8, 2016
In part 1 of this series we offered an example condenser water pumping system. The design of this example is 800 GPM per condenser for... READ MORE
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Parallel Pumping in Condenser Applications (Part 1)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 1, 2016
Applying a single constant-speed pump for each condenser in a chilled water application is a normal design for the HVAC engineer. The chiller manufacturers suggest... READ MORE
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Bell & Gossett Part Load Efficiency Value (Part 5): BTUH Load Output vs. Percent of Flow Tolerance
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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July 25, 2016
The last four segments of the R. L. Deppmann Monday Morning Minutes introduced the valuable PLEV tool from Bell and Gossett. The part load efficiency... READ MORE
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Bell & Gossett Part Load Efficiency Value Part 4: End-of-Curve Selections
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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July 18, 2016
When looking at Bell and Gossett pump selections, we often find higher part load efficiency (PLEV) pump choices are to the right of the BEP, or best... READ MORE
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Bell & Gossett Part Load Efficiency Value Part 3: HVAC Pump Selection
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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July 11, 2016
In the last two Monday Morning Minutes, we introduced the PLEV, or Part Load Efficiency Value, from Bell and Gossett. When we use part load... READ MORE
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Bell and Gossett Part Load Efficiency Value Part 2: How to use PLEV
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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June 27, 2016
In the last Monday Morning Minutes post, we introduced the PLEV, or Part Load Efficiency Value from Bell and Gossett. This week we look at some... READ MORE
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